JUKI MO-50e Manuel D'instructions page 28

Adjusting the thread
tension
Adjusting the thread tension
The left needle thread forms
loops on the underside:
Tighten the left needle thread
tension (yellow).
The right needle thread forms
loops on the underside:
Tighten the right needle thread
tension (green).
The looper loops are formed on
the underside:
Tighten the upper looper tension
(blue), or loosen the lower looper
tension (red).
The looper loops are formed on
the upper side:
Tighten the lower looper
tension (red), or loosen the upper
looper tension (blue).